Html5 Canvas Javascript庫？

Question

我想知道是否有任何JavaScript庫來幫助渲染圖形。我搜索谷歌，沒有找到任何工具。我想在畫布上製作高斯曲線。

Answer 1

這花了我15秒找到。玩它，直到它得到你喜歡的。

$(document).ready(drawGaussian); 

var canvasContext; 
var points; 
var noise = 0; 

function drawGaussian() 
{ 
canvasContext = document.getElementById("gaussian-canvas").getContext("2d"); 

document.getElementById("gaussian-canvas").onclick = cycleNoise; 

cycleNoise(); 
} 

function cycleNoise() 
{ 
canvasContext.clearRect(0, 0, 400, 400); 

var m = Math.random() > .4 
var amount = Math.round(Math.random() * 20000); 
var size = Math.round(Math.random() * 3)+1; 

document.getElementById("particles").innerHTML = amount; 
document.getElementById("size").innerHTML = size; 

switch(noise) 
{ 
    case 0: 
     drawGaussianField(amount, size, 200, 200, 400, 100, m); 
     document.getElementById("type").innerHTML = (m ? "Monochromatic" : "Chromatic") + " Field"; 
     break; 
    case 1: 
     drawGaussianCurves(amount, size, 200, 200, 400, 150, m); 
     document.getElementById("type").innerHTML = (m ? "Monochromatic" : "Chromatic") + " Curves"; 
     break; 
    case 2: 
     drawGaussianDiamond(amount, size, 200, 200, 400, 130, m); 
     document.getElementById("type").innerHTML = (m ? "Monochromatic" : "Chromatic") + " Diamond"; 
     break; 
    case 3: 
     drawGaussianOval(amount, size, 200, 200, 300, 300, m); 
     document.getElementById("type").innerHTML = (m ? "Monochromatic" : "Chromatic") + " Circle"; 
     break; 
    case 4: 
     drawGaussianBurst(amount, size, 200, 200, 120, 120, m); 
     document.getElementById("type").innerHTML = (m ? "Monochromatic" : "Chromatic") + " Burst"; 
     break; 
} 

noise++; 

if(noise > 4) noise = 0; 
} 


function drawGaussianField(amount, thickness, x, y, width, height, monochromatic) 
{ 
for(i = 0; i < amount; i++) 
{ 
    points = getGaussianPoints(); 

    setColor(monochromatic); 
    canvasContext.fillRect(x + ((width*.5) * points[3]), y + ((height*.5) * points[2]), thickness, thickness); 
} 
} 

function drawGaussianCurves(amount, thickness, x, y, width, height, monochromatic){ 
for(i = 0; i < amount; i++) 
{ 
    points = getGaussianPoints(); 

    setColor(monochromatic); 
    canvasContext.fillRect(x + ((width*.5) * points[0]), y + ((height*.5) * points[2]), thickness, thickness); 
} 
} 

function drawGaussianDiamond(amount, thickness, x, y, width, height, monochromatic){ 
for(i = 0; i < amount; i++) 
{ 
    points = getGaussianPoints(); 

    setColor(monochromatic); 
    canvasContext.fillRect(x + ((width*.5) * points[0]), y + ((height*.5) * points[3]), thickness, thickness); 
} 
} 

function drawGaussianOval(amount, thickness, x, y, width, height, monochromatic){ 
for(i = 0; i < amount; i++) 
{ 
    points = getGaussianPoints(); 

    setColor(monochromatic); 
    canvasContext.fillRect(x + ((width*.5) * points[0]), y + ((height*.5) * points[1]), thickness, thickness); 
} 
} 

function drawGaussianBurst(amount, thickness, x, y, width, height, monochromatic){ 
for(i = 0; i < amount; i++) 
{ 
    points = getGaussianPoints(); 

    setColor(monochromatic); 
    canvasContext.fillRect(x + ((width*.5) * points[2]), y + ((height*.5) * points[3]), thickness, thickness); 
} 
} 

function setColor(val){ 
if(val) 
{ 
    canvasContext.fillStyle = '#ffffff'; 
} 
else 
{ 
    canvasContext.fillStyle = "#"+Math.floor(Math.random()*16777215).toString(16); 
} 
} 

function getGaussianPoints(){ 
var x1, x2, w, y1, y2; 

do { 
    x1 = 2.0 * Math.random() - 1.0; 
    x2 = 2.0 * Math.random() - 1.0; 
    w = x1 * x1 + x2 * x2; 
} while (w >= 1.0); 

w = Math.sqrt((-2.0 * Math.log(w))/w); 
y1 = x1 * w; 
y2 = x2 * w; 

return [x1, x2, y1, y2]; 
} 

Answer 2

有幾個html5 canvas javascript庫。一個更完整的人是paper.js

Answer 3

Here是JavaScript庫

Answer 4

我已經使用並推薦KineticJS library在拉斐爾，紙和加工之間砸雜誌比較不錯。它會定期進行維護和更新。

Answer 5

Paper.js對於HTML5畫布非常有用。如前所述，您應該避免使用基於SVG或VML的庫，因爲大多數庫不能在Android設備上運行。